<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
    body{
      margin: 0
    }
    .mydiv{
      height:100vh;
      width:100%
    }
    .header{
      height:10%;
      width:100%;
      background:red;
    }
    .left{
      width:30%;
      height:80%;
      background:green;
      float: left
    }
    .body{
      width:70%;
      height:80%;
      background: grey;
      float: left;
    }
    .footer{
      width:100%;
      height:10%;
      background:pink;
      clear: both;
    }
  </style>
</head>
<body>
  <div class="mydiv">
    <div class="header">1111111111</div>
    <div class="left">2222222222222</div>
    <div class="body">33333333333</div>
    <div class="footer">444444444444</div>
  </div>
</body>
</html>